I found this gent's articles quite helpful: http://blog.konradvoelkel.de/2010/01/linux-ocr-and-pdf-problem-solved/ http://blog.konradvoelkel.de/2010/01/linux-o

I found this gent's articles quite helpful: http://blog.konradvoelkel.de/2010/01/linux-ocr-and-pdf-problem-solved/ http://blog.konradvoelkel.de/2010/01/linux-ocr-and-pdf-probl... http://www.konradvoelkel.com/2013/03/scan-to-pdfa/ http://www.konradvoelkel.com/2013/03/scan-to-pdfa/